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Editing: objimpl.h
#ifndef Py_CPYTHON_OBJIMPL_H # error "this header file must not be included directly" #endif #ifdef __cplusplus extern "C" { #endif #define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize ) /* _PyObject_VAR_SIZE returns the number of bytes (as size_t) allocated for a vrbl-size object with nitems items, exclusive of gc overhead (if any). The value is rounded up to the closest multiple of sizeof(void *), in order to ensure that pointer fields at the end of the object are correctly aligned for the platform (this is of special importance for subclasses of, e.g., str or int, so that pointers can be stored after the embedded data). Note that there's no memory wastage in doing this, as malloc has to return (at worst) pointer-aligned memory anyway. */ #if ((SIZEOF_VOID_P - 1) & SIZEOF_VOID_P) != 0 # error "_PyObject_VAR_SIZE requires SIZEOF_VOID_P be a power of 2" #endif #define _PyObject_VAR_SIZE(typeobj, nitems) \ _Py_SIZE_ROUND_UP((typeobj)->tp_basicsize + \ (nitems)*(typeobj)->tp_itemsize, \ SIZEOF_VOID_P) /* This example code implements an object constructor with a custom allocator, where PyObject_New is inlined, and shows the important distinction between two steps (at least): 1) the actual allocation of the object storage; 2) the initialization of the Python specific fields in this storage with PyObject_{Init, InitVar}. PyObject * YourObject_New(...) { PyObject *op; op = (PyObject *) Your_Allocator(_PyObject_SIZE(YourTypeStruct)); if (op == NULL) return PyErr_NoMemory(); PyObject_Init(op, &YourTypeStruct); op->ob_field = value; ... return op; } Note that in C++, the use of the new operator usually implies that the 1st step is performed automatically for you, so in a C++ class constructor you would start directly with PyObject_Init/InitVar. */ /* Inline functions trading binary compatibility for speed: PyObject_INIT() is the fast version of PyObject_Init(), and PyObject_INIT_VAR() is the fast version of PyObject_InitVar(). These inline functions must not be called with op=NULL. */ static inline PyObject* _PyObject_INIT(PyObject *op, PyTypeObject *typeobj) { assert(op != NULL); Py_SET_TYPE(op, typeobj); if (PyType_GetFlags(typeobj) & Py_TPFLAGS_HEAPTYPE) { Py_INCREF(typeobj); } _Py_NewReference(op); return op; } #define PyObject_INIT(op, typeobj) \ _PyObject_INIT(_PyObject_CAST(op), (typeobj)) static inline PyVarObject* _PyObject_INIT_VAR(PyVarObject *op, PyTypeObject *typeobj, Py_ssize_t size) { assert(op != NULL); Py_SET_SIZE(op, size); PyObject_INIT((PyObject *)op, typeobj); return op; } #define PyObject_INIT_VAR(op, typeobj, size) \ _PyObject_INIT_VAR(_PyVarObject_CAST(op), (typeobj), (size)) /* This function returns the number of allocated memory blocks, regardless of size */ PyAPI_FUNC(Py_ssize_t) _Py_GetAllocatedBlocks(void); /* Macros */ #ifdef WITH_PYMALLOC PyAPI_FUNC(int) _PyObject_DebugMallocStats(FILE *out); #endif typedef struct { /* user context passed as the first argument to the 2 functions */ void *ctx; /* allocate an arena of size bytes */ void* (*alloc) (void *ctx, size_t size); /* free an arena */ void (*free) (void *ctx, void *ptr, size_t size); } PyObjectArenaAllocator; /* Get the arena allocator. */ PyAPI_FUNC(void) PyObject_GetArenaAllocator(PyObjectArenaAllocator *allocator); /* Set the arena allocator. */ PyAPI_FUNC(void) PyObject_SetArenaAllocator(PyObjectArenaAllocator *allocator); PyAPI_FUNC(Py_ssize_t) _PyGC_CollectNoFail(void); PyAPI_FUNC(Py_ssize_t) _PyGC_CollectIfEnabled(void); /* Test if an object implements the garbage collector protocol */ PyAPI_FUNC(int) PyObject_IS_GC(PyObject *obj); /* Code built with Py_BUILD_CORE must include pycore_gc.h instead which defines a different _PyGC_FINALIZED() macro. */ #ifndef Py_BUILD_CORE // Kept for backward compatibility with Python 3.8 # define _PyGC_FINALIZED(o) PyObject_GC_IsFinalized(o) #endif PyAPI_FUNC(PyObject *) _PyObject_GC_Malloc(size_t size); PyAPI_FUNC(PyObject *) _PyObject_GC_Calloc(size_t size); /* Test if a type supports weak references */ #define PyType_SUPPORTS_WEAKREFS(t) ((t)->tp_weaklistoffset > 0) PyAPI_FUNC(PyObject **) PyObject_GET_WEAKREFS_LISTPTR(PyObject *op); #ifdef __cplusplus } #endif
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